@proYorp: Thanks. And not all that crazy, I've heard something like that before: that I'm very good at making difficult levels with devious puzzles requiring player to know how to control Keen. It seems to be my strength but unfortunately it's not something (and I understand why!) most people like all that much. Also, it's nice to hear you're waiting for the mod, I hope it'll show another side of levelling that I've been trying to cultivate. As for the two fiery scrubs, I assume you mean the two scrubs that are each circling a solid block with a dangerous tile on top of it. You have to jump on the scrub (the one on right) as it climbs, from that jump on the scrub on the left as it descends, and from that jump onwards on left, high enough that the scrub appearing from below the wall has enough time to appear. It's a tricky sequence all right.

Anyway, I finally managed to write some comments:

PaquoCastor: Liking the multiple routes.

Shikadi: Liking the sparser use of scrubs, especially the jumping puzzle on the right side.

LevelLord: Easy, considering whom it was made by.

Levellass: I still don't get it, sort of.

Quillax: Liking the routes, the challenge. Perhaps the best level design of the bunch. Also liking those pixel characters, well done with the animated tiles.

Roobar: One of my favourites. Great idea with the repeated "5-bar" design which saves the day where it's impossible to see what awaits. Cohesive. At first didn't even realize there were alternative routes, I just somehow ended up on them and thought that somehow stuff looks different. Also visually pleasing.

KeenRush: It's difficult alright, but far from impossible. I've said stuff about this level earlier in the topic.

Nisaba: One of the best. Gotta love that taunting beginning. Incredibly well-made level and the most difficult in this pack, to me. Certain parts of the level caused so much cursing... So many good puzzles. Some were truly wicked, requiring and displaying thorough understanding of Keen's movement. I can't understand how someone actually designs puzzles like these, with so many moving parts. "Could it be this person is as wicked as I am?" was my thought several times.

troublesomekeen: Liking the timed scrub jump in the beginning. Offers some interesting and difficult routes.

CommanderSpleen: This is one of the best non-mod levels I've ever played and also one of the best recent Spleen levels, I think. Such wild inventiveness. Not just utilizing the pogo trick, but also the way scrubs are dropped from one area to another simply by viewing the area. So good.

proYorp: More sceneric than challenging, but nevertheless an interesting level.

Levellad: It's not the worst level I've played.

I still haven't voted, I don't know how I can decide between Nisaba's and Spleen's.